# i = 0
# while i < 15 :
#     j = 0
#     while j < 100 :
#         print("*",end="")
#         j += 1
#     print()
#     i += 1
i = 0
while i < 15:
    j = 0
    while j < i + 1:
        print("*", end="")
        j += 1
    print()
    i += 1
